Engineering 3D Interpenetrated ZIF-8 Network in Poly(ethylene oxide) Composite Electrolyte for Fast Lithium-Ion Conduction and Effective Lithium-Dendrite Inhibition

Abstract

A novel 3D ZIF-8 network-reinforced polyethylene oxide (PEO) composite polymer electrolyte (Z-C-PAN-PEO) is successfully built, in which the network with an interpenetrated structure is tactfully developed by in situ assembling ZIF-8 nanoparticles on electrospinning carboxylated polyacrylonitrile (C-PAN) nanofiber surfaces. ZIF-8 with high porosity and unsaturated open metal sites will act as the bridge between C-PAN nanofibers and the PEO matrix. It is proven that the selected ZIF-8 can play a significant role in facilitating Li + conduction and transference by effectively interacting with the oxygen atoms of C−O−C to promote the segmental movement of PEO and immobilizing TFSI − anions to release more free Li + . The 3D interpenetrating structure of Z-C-PAN further enables the conduction channels more consecutive and long-ranged, endowing the Z-C-PAN-PEO electrolyte with an optimum ionic conductivity of 4.39 × 10 −4 S cm −1 and a boosted Li + transference number of 0.42 at 60 °C. Other improvements occurring in the reinforced electrolytes are the broaden electrochemical stability window of ∼4.9 V and sufficient mechanical strength. Consequently, the stable Li-plating/stripping for 1000 cycles at 0.1 mA cm −1 witnesses the splendid compatibility against Li dendrite. The cycling performance of LiFePO 4 /Z-C-PAN-PEO/Li cells with a reversible capacity of 116.2 mAh g −1 after 600 cycles at 0.2 C guarantees the long-term running potential in lithium metal batteries. This study puts forward new insights in designing and exploiting the active role of MOFs for highperformance solid polymer electrolytes.

PEO/Li1.25Al0.25Zr1.75(PO4)3 composite solid electrolytes for high-rate and ultra-stable all-solid-state lithium metal batteries with impregnated cathode modification

“…8c). In recent years, in the LFP battery system, the electrochemical performance of the SE prepared with PEO based [55][56][57][58][59][60] is shown in Fig. 8d; our work shows the high rate and ultrastable electrochemical performance of the PLL20 SE in this study (details are shown in Table S1 †).…”

The Versatile Establishment of Charge Storage in Polymer Solid Electrolyte with Enhanced Charge Transfer for LiF‐Rich SEI Generation in Lithium Metal Batteries

“…Figure 5e and Table S4 compares the cycling performance of reported polymeric solid electrolytes. [37][38][39][40][41][42][43][44] Moreover, by varying the current density from 0.1 to 0.2, 0.5, 1 and 2 C (Figure 5d), the discharge capacity of the PEO-POF cells was increased by 166.8, 154.3, 146.8, 137.4 and 123.6 mAh g À 1 . When the current density was returned to 0.1 C, the reversible charge/discharge capacity of the PEO-POF cell was still as high as 162.8 mAh g À 1 , which showed a very good multiplicative performance.…”

Solid-state composite electrolytes: turning the natural moat into a thoroughfare

“…35 Apart from adding plasticizers into the PEO-based electrolyte, the metal organic frameworks (MOF) with unsaturated open metal sites can play a significant role in facilitating Li and the LFP/Z-C-PAN-PEO/Li cells give a reversible capacity of 116.2 mA h À1 g À1 after 600 cycles at 0.2C. 36 Zhang et al synthesized 3D oxygen-vacancy-rich Gd-doped stannic oxide (SnO 2 ) nanotube networks (GDS NTs) via electro-blow spinning and high-temperature calcination methods. The usage of GDS NTs validly enhances the electrochemical and mechanical properties of the electrolyte.…”